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MAINTENANCE
2.
Replace filter element (4) with a new one.
3.
Install cover (3) and nut (2).
In order not to damage the threaded portion of nut, tighten
nut (2) by hand until it is seated, then tighten it 15 to 30° by
using a tool.
NOTICE
If breather assembly (1) is removed for replacement,
apply a tool to bolt (5) and tighten it.
Tightening torque: 30 to 40 Nm{3.1 to 4.1 kgm}
METHOD FOR REPLACING DEF TANK BREATHER ELEMENT
Do not replace the element immediately after engine is stopped.
NOTICE
•
Komatsu recommends using Komatsu genuine parts for replacement parts.
•
If the machine is operated without DEF tank breather element attached, or with the element other
than Komatsu genuine parts, foreign materials may enter into DEF pump and DEF injector which
will cause failure of the machine. Never operate the machine without DEF tank breather element at-
tached, nor use the element other than Komatsu genuine parts.
•
Do not flush DEF tank breather element. Flushing or regenerating of it will degrade the performance
of element, and will cause the breakage of DEF tank. Never reuse the DEF element.
•
Always stop the engine and clean around DEF tank before replacing.
•
After the engine is stopped, DEF system devices automatically purge DEF in DEF injector and DEF
pump and return it to DEF tank to prevent malfunction of the devices caused by freezing of DEF or
deposition of urea.
After the engine is stopped, the devices are operated for a few minutes. Replace the element after
DEF system devices stop.
•
Improper assembly of DEF tank breather element may cause leakage of DEF. Replace the element in
the correct procedure.
1.
Open DEF tank cover at the right of the machine upward.
2.
Remove nut (2) of breather assembly (1) at the top of DEF
tank, then remove cover (3).
3.
Replace breather (4) with a new one.
4.
Install cover (3) and nut (2).
In order not to damage the threaded portion of nut, tighten
nut (2) by hand until it is seated, then tighten it 15 to 25° by
using a tool.
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WARNING
MAINTENANCE PROCEDURE
4-71
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